linux-kernel - RE: bug in cleancache ocfs2 hook, anybody want to try cleancache?

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Message-ID: <3904dcad-951e-43ca-bd2d-1c906d0b0a9e@default>
Date:	Tue, 26 Jul 2011 07:54:31 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Steven Whitehouse <swhiteho@...hat.com>
Cc:	ocfs2-devel@....oracle.com, Joel Becker <jlbec@...lplan.org>,
	Sunil Mushran <sunil.mushran@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: RE: bug in cleancache ocfs2 hook, anybody want to try cleancache?

> > > Also, as regards your earlier question wrt a kvm backend, I may be
> > > tempted to have a go at writing one, but I'd like to figure out what
> > > I'm letting myself in for before making any commitment to that,
> 
> > I think the hardest part is updating the tmem.c module in zcache
> > to support multiple "clients".  When I ported it from Xen, I tore
> > all that out.  Fortunately, I've put it back in during RAMster
> > development but those changes haven't yet seen the light of day
> > (though I can share them offlist).
> 
> I'd like to try and understand the design of the existing code before I
> consider anything more advanced such as writing a kvm backend,

FYI, the "hardest part" (support for multiple clients) is now in
Linus's tree as of today.  With a little hypercall and glue code,
KVM might just work now with tmem/cleancache/frontswap.

Dan

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